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PDF MAX6138 Data sheet ( Hoja de datos )
| Número de pieza | MAX6138 | |
| Descripción | SC70 Shunt Voltage Reference | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-2090; Rev 2; 4/04
www.DataSheet4U.com
0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
General Description
The MAX6138 is a precision, two-terminal shunt mode,
bandgap voltage reference available in fixed reverse
breakdown voltages of 1.2205V, 2.048V, 2.5V, 3.0V,
3.3V, 4.096V, and 5.0V. Ideal for space-critical applica-
tions, the MAX6138 is offered in the subminiature 3-pin
SC70 surface-mount package (1.8mm X 1.8mm), 50%
smaller than comparable devices in SOT23 surface-
mount packages.
Laser-trimmed resistors ensure precise initial accuracy.
With a 25ppm/°C temperature coefficient, the device is
offered in three grades of initial accuracy ranging from
0.1% to 0.5%. The MAX6138 has a 60µA to 15mA shunt-
current capability with low-dynamic impedance, ensuring
stable reverse breakdown voltage accuracy over a wide
range of operating temperatures and currents.
The MAX6138 does not require an external stabilizing
capacitor while ensuring stability with capacitive loads.
The MAX6138 is a higher precision device in a smaller
package than the LM4040/LM4050.
Applications
Portable, Battery-Powered Equipment
Notebook Computers
Cell Phones
Industrial Process Control
Features
o Ultra-Small 3-Pin SC70 Package
o 0.1% (max) Initial Accuracy
o 25ppm/°C (max) Temperature Coefficient
Guaranteed Over -40°C to +85°C Temperature
Range
o Wide Operating Current Range: 60µA to 15mA
o Low 28µVRMS Output Noise (10Hz to 10kHz)
o 1.2205V, 2.048V, 2.5V, 3.0V, 3.3V, 4.096V, and 5.0V
Fixed Reverse Breakdown Voltages
o No Output Capacitors Required
o Stable with Capacitive Loads
Selector Guide
PART
TEMP
RANGE
PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAX6138_EXR12-T -40°C to +85°C 3 SC70-3 1.2205
MAX6138_EXR21-T -40°C to +85°C 3 SC70-3 2.0480
MAX6138_EXR25-T -40°C to +85°C 3 SC70-3 2.5000
MAX6138_EXR30-T -40°C to +85°C 3 SC70-3 3.0000
MAX6138_EXR33-T -40°C to +85°C 3 SC70-3 3.3000
MAX6138_EXR41-T -40°C to +85°C 3 SC70-3 4.0960
MAX6138_EXR50-T -40°C to +85°C 3 SC70-3 5.0000
Ordering Information appears at end of data sheet.
Typical Operating Circuit
Pin Configuration
VS
TOP VIEW
+1
MAX6138 3 N.C.*
-2
SC70
*PIN 3 MUST BE LEFT FLOATING
OR CONNECTED TO PIN 2.
RS
ISHUNT
ISHUNT + ILOAD
ILOAD
VR
MAX6138
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
ELECTRICAL CHARACTERISTICS—MAX6138_41 (4.096V)
(IR = 100µA, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown
Voltage (Note 2)
SYMBOL
VR
CONDITIONS
MAX6138A (0.1%)
TA = +25°C
MAX6138B (0.2%)
MAX6138C (0.5%)
MIN
4.0919
4.0878
4.0755
TYP
4.0960
4.0960
4.0960
Minimum Operating
Current
IRMIN
50
Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
TC
4
Reverse Breakdown
Voltage Change with
Operating Current Change
Reverse Dynamic
Impedance (Note 3)
Wideband Noise
Reverse Breakdown
Voltage Long-Term
Stability
∆VR/∆IR
ZR
eN
IRMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 15mA
IR = 1mA, f = 120Hz, IAC = 0.1IR
10Hz ≤ f ≤ 10kHz
∆VR t = 1000h
0.5
3.0
0.5
64
120
MAX
4.1001
4.1042
4.1165
73
25
1.2
10.0
1.0
UNITS
V
µA
ppm/°C
mV
Ω
µVRMS
ppm
ELECTRICAL CHARACTERISTICS—MAX6138_50 (5.0V)
(IR = 100µA, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Reverse Breakdown
Voltage (Note 2)
Minimum Operating Current
SYMBOL
VR
IRMIN
CONDITIONS
MAX6138A (0.1%)
TA = +25°C
MAX6138B (0.2%)
MAX6138C (0.5%)
MIN
4.9950
4.9900
4.9750
TYP
5.0000
5.0000
5.0000
54
Reverse Voltage
Temperature Coefficient
(Notes 2, 3)
TC
4
MAX
5.0050
5.0100
5.0250
80
UNITS
V
µA
25 ppm/°C
Reverse Breakdown
Voltage Change with
Operating Current Change
∆VR/∆IR
IRMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 15mA
0.5 1.4
mV
3.5 12.0
Reverse Dynamic
Impedance (Note 3)
ZR IR = 1mA, f = 120Hz, IAC = 0.1IR
0.5 1.1
Ω
Wideband Noise
eN 10Hz ≤ f ≤ 10kHz
80 µVRMS
Reverse Breakdown
Voltage Long-Term Stability
∆VR t = 1000h
120 ppm
Note 1: All devices are 100% production tested at +25°C and are guaranteed by correlation for TA = TMAX to TMIN, as specified.
Note 2: TC is measured by the “box” method, i.e. (VMAX - VMIN) / (TMAX - TMIN)
Note 3: Guaranteed by design.
_______________________________________________________________________________________ 5
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0.1%, 25ppm, SC70 Shunt Voltage Reference
with Multiple Reverse Breakdown Voltages
Pin Description
PIN NAME
FUNCTION
1 + Positive Terminal of the Shunt Reference
2 - Negative Terminal of the Shunt Reference
3
N.C.
No Connection. Leave this pin unconnected or connect to Pin 2.
Detailed Description
The MAX6138 shunt reference uses the bandgap prin-
ciple to produce a stable, accurate voltage. The device
behaves similarly to an ideal zener diode; a fixed volt-
age is maintained across its output terminals when
biased with 60µA to 15mA of reverse current. The
MAX6138 behaves similarly to a silicon diode when
biased with forward currents up to 10mA.
Figure 3 shows a typical operating circuit. The
MAX6138 is ideal for providing a stable reference from
a high-voltage power supply.
Applications Information
The MAX6138’s internal pass transistor is used to main-
tain a constant output voltage (VSHUNT) by sinking the
necessary amount of current across a source resistor.
The source resistance (RS) is determined from the load
current (ILOAD) range, supply voltage (VS) variations,
VSHUNT, and desired quiescent current.
Choose the value of RS when VS is at a minimum and
ILOAD is at a maximum. Maintain a minimum ISHUNT of
60µA at all times. The RS value should be large enough
to keep ISHUNT less than 15mA for proper regulation
when VS is maximum and ILOAD is at a minimum. To
prevent damage to the device, ISHUNT should never
exceed 20mA.
Therefore, the value of RS is bounded by the following
equation:
[VS(MIN) - VR] / [60µA + ILOAD(MAX)] > RS >
[VS(MAX) - VR] / [20mA + ILOAD(MIN)]
Choosing a larger resistance minimizes the total power
dissipation in the circuit by reducing the shunt current
(PD(TOTAL) = VS X ISHUNT). Provide a safety margin to
incorporate the worst-case tolerance of the resistor
used. Ensure that the resistor’s power rating is ade-
quate, using the following general power equation:
PDR = ISHUNT ✕ (VS(MAX) - VSHUNT)
VS
RS
ISHUNT
ISHUNT + ILOAD
ILOAD
VR
MAX6138
Figure 3. Typical Operating Circuit
Output Capacitance
The MAX6138 does not require an external capacitor
for operational stability and is stable for any output
capacitance.
Temperature Performance
The MAX6138 typically exhibits an output voltage tem-
perature coefficient within ±4ppm/°C. The polarity of
the temperature coefficient may be different from one
device to another; some may have positive coefficients,
and others may have negative coefficients.
Chip Information
TRANSISTOR COUNT: 70
PROCESS: BiCMOS
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX6138.PDF ] | |
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